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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51f728c5f4a0de80d6f770c0e829d24858c522c4d149e628d6ce4826b6eb816' 
  AND token = 'ldC2hwwOTONTav8QgSx1J+aXDtwRbrNODnsHg0Dsrgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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