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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3c7d9cf1c119e353dc152dc0b7b52e2750e9faa535a32ddb84798d62da0a28' 
  AND token = 'POa2FKvLDosu7LE385BoDqenXYcmIkO8UDvAEUvRomk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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