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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201e6f198389454ea18a4035b7e67a92128fc9283321e5f84111b5344a2467ae' 
  AND token = 'n0x0W9OqAG5nPKavh3HFRhpzdaQ6w5uBxWfNPc2DQhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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