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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0a14355c978823597e1d0f14cca7c3de6b78b2d9c54215a439c5671ef70f9e' 
  AND token = 'hW54moRcy3x6p6EAZnyB5ClhyfuPMT1IcxNxF/YatYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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