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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ffbdf498897cb95cf4cd4403d849315b15975f3ffad161a71daef503604e25' 
  AND token = '5PUjku1tFock/quSY0YBFQAFl4dlL5vXxwVhcXn45ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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