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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f923f32ec76c81d5ab9480715e7786f736b0b1da563d29a2e9d0c65ba35e9a6b' 
  AND token = 'n+9Vnp1lEijno6QpwbNXPGBf0SGab/N0rEXKHuXWxQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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