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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c27bd5f56cfcbe980c741042087731719f9add9005adc6d34acc3e68bf52bed' 
  AND token = 'uNX5Iia07XcN4hywsIC13dCOvGBlqwEG8ebAKF6CbG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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