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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4593d9062f971078322f7d01c255043a08c1bc1a679e8f9fc7f7b30c6408e0ef' 
  AND token = 'WZ8/dxKAXp/HjSe0/5BYw5Kiad9x8iGNZNakc+W+G24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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