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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4471d14c65adac316989e923f52b1d1e7831ce891f682dec55a3003bf90633d8' 
  AND token = 'UPgxe5RVmHyA20hg92hzWx8lOhRf9OKnc61+de1cMk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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