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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee61f657b16308a29d9258d2b4b130d9a90f7cf414f6a3235d5162fd8cea0791' 
  AND token = 'IipKYLeUIGpzNE9l1l5lD9rLxp6HFj3rQ1LEGgD2T/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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