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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b227cb89fc13d694262ae1da3983f4d84548d258988dac5b28ce74d976bb5afa' 
  AND token = 'eOdVWp9CneWoTg/WlkWrX2zs7DR065PL3j2Q170H4JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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