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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37eb06cb360de793ee5f4cca5072d4e0de66e9ce7e06b24090524229418cac82' 
  AND token = 'I2zcF+8m+fQuESFpfzJaPFBa1lfhMd3a3pFux51N3BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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