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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dc143be828ab6f07268e500dc2b717f9d854ab1e07647be4d98638e9880527' 
  AND token = 'OEGd6Smda6ay6XrebJvHzQ5zextru7nDIBYOSkErFw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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