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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe6c4b9973f59dfe6cf5c110f5388fca69fcb13e622ba986b22dca658e83c71' 
  AND token = 'kpJvWLwI/fSEyAtoNfszS1EQca+m08hwmW+iMY65rL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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