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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78038e9b3a10fcaf8da775293240397fd89b88fd5fb6c6be4fc00bad17131348' 
  AND token = 'pV+fHu9zHfAl9dNICy2UgPIYUcZk1aI7uqfvgRcy3iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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