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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b86db9c73e1336f70267387c5f3697c405707d2a463e8b51626cb1dc9571583' 
  AND token = '3Tth/tdhOM2fcSd+AFXQjSPNhZwrTB+b2ZNZBOrtE20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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