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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eff8c90f10bf4ec0ed8ffbfdd1c3634d97f7f92ae6f50cd4cc27121b5986e4c' 
  AND token = '+dfltefenSUPsn7YZ76qwY/eSQx5i7ZljsQYFBp/A/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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