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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd486a6b23626990dbf0ff810619f9233c5831351eb001df6e57beea799fc60' 
  AND token = 'bVWhwINp/U69HYxTCAYczLVJlgDAx7LLy8cxuNm8Sb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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