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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efa6fce9f51cb1b56155ac9bfeb3339d908808428df75dad509db41d0bd3be9' 
  AND token = 'a077/3IqFrxqufA6VOUlLy6YH3NOPl1gAkqcMKkJv40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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