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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5be7920e8cd0faa34276ae41cb34dc18c732cb9861d89ff418ba4ab21b2292a' 
  AND token = 'GO7XdX7NdEUc2BIvjpIQI5fqdgmNi5UA9MDyUSS4Fb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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