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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d2290e4cd0e4bf28278b1b51bcfc26b261cc4e080712ba1b1f9e59b921a6db' 
  AND token = 'zyy2nXJzlSMTf+9e34w18iL+iNTuSikE0dOVDDY0s5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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