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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fbbf5ae468a5d7790ed44fbcd269aff163494b987558052ff855e3bd4c5d64' 
  AND token = 'WoIIMIMTI5nGksmint4JVlDThqpOtC6gSYVRIdJK040=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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