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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73e21f6a206229a37a0c76125efce892e5de667c2166adedbc88a1ad6b842aa' 
  AND token = '9qwMDyYBjg4g1W7e/IFTxt5m4iZMUtjBZJJ/eGDOFp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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