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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb01fe974638c853e6aa3012d931708af178c8120457db4ce5bc57ebf0211f28' 
  AND token = 'yjJkaO1/MPv/NpP/iZNXcQ8ubKGTtM3UvqCNdBYHeo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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