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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcbc1fdda2ea1678f19a469a6364f3be8ca6a1a1b9b77bc9b1911086cdd4a9b2' 
  AND token = 'dePzGx7xeNtYCcuWVFQ+kLd+/Tx4EfuwUzMYC2F6+s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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