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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebff734aacf8f725f2817f4f7f53a00dda7dd01efa80340eca5e44bb35fa3ed' 
  AND token = 'ViMYaPUzreRVZ1spMEUN/W6bkNaEu8Qv+w+VVjtBiHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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