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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ec08c8811879b67686c9cab4d960a761618753eafd3dd102c300de59ad529b' 
  AND token = 'R7pgSzoxCFzOsr26UII9A+WKYjS/SqRTavdNKtBqy94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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