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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7205a2aeed60e10e8933df86913b2da30f7c9aacc5c1e531bbdf2bd6a38427a0' 
  AND token = 'prVVU/sgtuF4Ea3EhZjMl4LeYdWSCwrFdMroTclz1LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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