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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc2e58ba73d223bcf1e4ddd304f943918f90d5e410456c3096467d01b027967' 
  AND token = 'VaPF34XGyuphx66izYI+c6rI+9tOHb/ZjdCHo0QPMPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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