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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56d1d06b3f0acf10502dbd4d8bcbf859a0d1b7bf917e5762b7ddcd8c41fddc4' 
  AND token = 'Adumrgu3PzxKA3bZCZhqf24Z3r3QD6jml7ZTffTocIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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