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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d99bfd2340900db2746bb5c33e2441bb13a2a354d0e82014d665f3957d97f00' 
  AND token = 'ytKQmA6FGcaAyAlM4FZP0Ns62vaPImqNUnYMk4De5QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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