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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4233c7da0cb75b6d97b632726246f02d877dcccfb03b18d0e368bb356c9c752e' 
  AND token = 'Ux057nsyqtAXkah1kehK7wKw+9HsqbgB0YA03jAfobQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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