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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377c8b523abb0f4f672c434248c4970789c98166e2d0819bae2ea5321a240dfb' 
  AND token = 'c0z6WGFIB6OyyZ4m3q5hcRdgHnICXlTf2C0s+s+/GZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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