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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7b548f4444109c5f2b2608b32116711d265f28102fa44dad169d5b971015b9' 
  AND token = 'ZETdsoCBq2Wy8KLtMMUisL3Y9KBZJA1zSyGIitbk8e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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