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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710f761cb9ec1f3464a06cd974d763b4b26463fe82c32138029095e307f6c1f3' 
  AND token = 'ikS4eDI10EWV9CeEcw9+KToZmsk6iYudVieflgkGgCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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