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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288da1d06d4dbe44e38161f28df2bad3d6bc4a14d541c66361c56cae58c1c4da' 
  AND token = 'bIieMVbVqfizkVOUhjWwXZPAhC+77ZaPG+8DBJG1t+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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