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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1ac0d66b6ebe38d78762ae22320d691b41c72cbb1f74d799e8029f72f82e20' 
  AND token = 'T4AyqMDCveb8biB3j1U1M/9KyKbWu88HOJpNVhB00So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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