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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900f5876a7069e392c607afdb1431b44b66bd779afb8c3ad3abed57cbd4317e7' 
  AND token = 'ZKm6DezR0EU0VQ8nrlmg/fGmBng5bSbbJEjDffoGLIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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