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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2a09a59c0911bc01bd5cad9d85b6737059171c68ed9c5810b9014debaa48cb' 
  AND token = 'uZrc/enjkbCO9QF/7VLzgmH3+k5susvWqPV3/BMXE+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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