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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a3ba0f59e0b45c5cf7f33d1979cae4882787e27163f8da60adf05c65471974' 
  AND token = 'tGea09npOfP+90EAFPhjsqFSbROHfOeTvxC4j8ZoiJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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