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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7fad37b86ae10cd750034767c5bfc6e9a5f2d8a613223c9b4327cffe2f3a24' 
  AND token = 'QuHpEKu2VnON1M47tFJrnPVptCwjZiD6/FdHRmGn6Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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