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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e18318a82e3779d0b4eeb1e156c30f5e94206e878d19d025804c5b41574b1a' 
  AND token = 'D7MSMnPclE0A84IO/b/IdfeyC3qpefS2/vGTD9J6XXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}