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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5451bf082a5e5828944f33f138a0bc913cc95a86b4ba64b51523a6382974491' 
  AND token = 'XVFr7S5xwtQiE7tYEK5fyjJFMNBkDydrUTtZXI3YJcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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