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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac9a8300c070f934ef8957c574acd02e9560c958337d76494ef7713dd58fe6e' 
  AND token = 'kb3WfCo0dPkcn68Li9zVVe1ObJk1ssn2i5Sk09G1m3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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