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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5975b6fb41962b371d07f868d1dda2e3414ef06efc6ca307a9f15e7d49bbd16c' 
  AND token = 'iEixs4mWISp6RCTGHJ2l7rN43sGJb4PlCMnKD5nEV4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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