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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448aa33599796363ffa9cb61ad8aa84c6d72ec3a5c1e3bccba8500a0f7fe3534' 
  AND token = 'TQUMLqR9fTZJE9at628E6YLqPluO7d7fxHJjpmDz+Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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