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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5f11dad11163ada25955082713f164f9e43534254a12e87000c402f2300c73' 
  AND token = '0Fs3+q/mDW0fFZhFFe1jKuSypUokcKL7DdXWpzNlfx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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