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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa0b7d5416e412d0181662ddd727875f2b0bde3c1bd66fc412ab98f36478c7b' 
  AND token = 'MmVCQhEQpWou1Iz0BvE0ATx17WMsJE9vHew/KHsu4xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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