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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ed6a1aff22f9a25ec1213941889767a8e9090af30e69bcd66e22dae1d91f6a' 
  AND token = 'BMQr5ZfezPBcO8z9GH5H656AsW460cX0iHpuiC3nw+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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