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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2695a0eec63a3063e36eab897b94ebf1b1f4ec7e1f226b74836fbb1e6c8800f3' 
  AND token = '4HyYCRLI8ql1psFDuX5jWA0wCr14L6aIgCqbL12b0nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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