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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef65ba8114a0a9a6f4c3fee8c7e951fc81eeb342786e9dbb21bc2a660d072596' 
  AND token = 'M7EW/sK4f7ahTTEPQym0zy3YMSRNTujl1b78utl9nMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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