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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fd8385425fb7c43af883bb0d3cc9c352f1e6eaf132a6e514dc56f1e32cb20e' 
  AND token = '6017bo5zN4ODZoo+S0oEtfbsASZP4QNkQwwDzRbUcC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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