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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f999d661d700eabcddd62a53c11cc4c4d177a50c19d9457246d93a439e2c7765' 
  AND token = 'GiA8Aoy6oLp2ugP5tCq/evKZv8x5OrPyumluqalomzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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