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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2621d4fe565efe41794d0dadf79c7f3ef706a31b4db13169997711aa00ba12' 
  AND token = '4ZI3vG/p3Am7NYbZwr9b+NSX5KIX/CCr+RPfR1uspGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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