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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57fa5ef095c8337a58079d7d04d5513b6cbce36955a4fe8ebfee608a0a07bffd' 
  AND token = 'pDZiHsTgMsMX+3X7X2Wvai3LYMsn7fhUPb1r0NMRMxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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