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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70c768b4678137947f7ab3c6686f010c43585e2549052f631023923336624ab' 
  AND token = 'Bk+ajp7RAlEjnn+6CSweOq4+2+nOOmjrfU12uT81u9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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