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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b2df856b7cd00d9232e7757640ed4dec001379fb5902f61416ba80ddfe89c1' 
  AND token = '/GLtDpOdggSB+7ng2NZ5aTyrc61zkHzCcsHr07AgAis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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