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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72743c1f75391ba21b2b80ad7e08fe16b0a3d84405dd50d2d43d042c19240973' 
  AND token = '97+rLCyYwOBV7Faf3MCEEJVRSJaSJNNdI6BK0bUuBEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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